If you really want book descriptions on your kindle there is a way, although it does take some work. You can use Calibre to create a catalog of your books (it an option under "convert"). This will create a new book that you can send to your kindle and it will have all the metadata info including descpritions. It's pretty neat, especially if you want access to book descriptions when you don't or can't have the wireless on. The work involved is getting all the book descriptions into calibre, for some books I actually had to copy/paste the book descriptions from the book's site.

Then to see the description, you'd search that catalog...you won't be able to open the book from here, but you can read a description and any tags you've made in calibre (my tags are the same as my collections). It's not the greatest solution, but it does work in a pinch.